diff --git a/resources/tester/helper_280_2_step_nav.cjs b/resources/tester/helper_280_2_step_nav.cjs
index 92ed1250a..01d9efb6d 100644
--- a/resources/tester/helper_280_2_step_nav.cjs
+++ b/resources/tester/helper_280_2_step_nav.cjs
@@ -123,6 +123,7 @@ const STUBS = {
   },
   "./ui_template_locale": { t: (key) => key },
   "./ui_template_modal": { openModal: () => undefined },
+  "./ui_template_help_edit": { attachHelpEditing: () => ({ flush: () => undefined }) },
   "./ui_template_elements": {
     showToast: (message) => toasts.push(message),
     el: (tag) => new FakeNode(tag),
diff --git a/resources/tester/helper_359_2_late_actions.cjs b/resources/tester/helper_359_2_late_actions.cjs
new file mode 100644
index 000000000..2d9f78f8a
--- /dev/null
+++ b/resources/tester/helper_359_2_late_actions.cjs
@@ -0,0 +1,141 @@
+/* 요구 359-2 · 360-2 — 좌측 패널 [?] 자리. `ui_template_overlay.ts` 를 트랜스파일해 가짜 DOM 위에서
+ * 액션 줄을 ① 패널 세우기 전(E05 꼴) ② 세운 뒤(E03 · E04 · E06 · E07 꼴)에 붙여 쪼갬 · [?] 를 JSON 한 벌로 냄.
+ */
+const path = require("path");
+const { makeLoader } = require("./helper_ts_stub_loader.cjs");
+
+const ROOT = path.join(__dirname, "..", "..");
+
+class FakeNode {
+  constructor(tag) {
+    this.tagName = tag;
+    this.children = [];
+    this.parent = null;
+    this.style = {};
+    this._classes = new Set();
+    const self = this;
+    this.classList = {
+      add: (...n) => n.forEach((x) => self._classes.add(x)),
+      remove: (...n) => n.forEach((x) => self._classes.delete(x)),
+      toggle: (n, f) =>
+        (f === undefined ? !self._classes.has(n) : !!f)
+          ? self._classes.add(n)
+          : self._classes.delete(n),
+      contains: (n) => self._classes.has(n),
+    };
+  }
+  set className(v) {
+    this._classes = new Set(String(v).split(/\s+/).filter(Boolean));
+  }
+  get className() {
+    return [...this._classes].join(" ");
+  }
+  get parentElement() {
+    return this.parent;
+  }
+  get firstChild() {
+    return this.children[0] ?? null;
+  }
+  get childElementCount() {
+    return this.children.length;
+  }
+  _adopt(kid) {
+    if (kid.parent) kid.parent.children = kid.parent.children.filter((c) => c !== kid);
+    kid.parent = this;
+    return kid;
+  }
+  append(...kids) {
+    kids.forEach((k) => this.children.push(this._adopt(k)));
+    mutated();
+  }
+  prepend(...kids) {
+    this.children.unshift(...kids.map((k) => this._adopt(k)));
+    mutated();
+  }
+  setAttribute() {}
+  addEventListener() {}
+  querySelector(selector) {
+    const cls = selector.slice(1);
+    let hit = null;
+    const walk = (n) =>
+      n.children.forEach((k) => {
+        if (!hit && k._classes.has(cls)) hit = k;
+        if (!hit) walk(k);
+      });
+    walk(this);
+    return hit;
+  }
+}
+// 진짜 MutationObserver 처럼 바뀐 뒤 한꺼번에 — `flush()` 가 부름(지켜보는 것만 · 끊으면 안 부름)
+const observers = new Set();
+let dirty = false;
+function mutated() {
+  dirty = true;
+}
+function flush() {
+  while (dirty) {
+    dirty = false;
+    [...observers].forEach((o) => o.cb());
+  }
+}
+globalThis.MutationObserver = class {
+  constructor(cb) {
+    this.cb = cb;
+  }
+  observe() {
+    observers.add(this);
+  }
+  disconnect() {
+    observers.delete(this);
+  }
+};
+globalThis.document = { createElement: (tag) => new FakeNode(tag) };
+globalThis.window = { innerWidth: 1600 };
+
+const { loadTs } = makeLoader({
+  root: ROOT,
+  stubs: {
+    "./ui_template_locale": { t: (key) => key },
+    "./ui_template_help": {
+      placeHelpButton: (actions) => {
+        const button = new FakeNode("button");
+        button.className = "ui-help-btn";
+        actions.prepend(button);
+      },
+    },
+    "./ui_template_overlay_drag": { makePanelDraggable: () => ({ refresh() {} }) },
+    "/b_workflow_nav": { fetchWorkflowState: async () => ({}) },
+    "/b_page_state": { readByKey: () => null, writeByKey: () => undefined },
+    "/device_context": { SIZE_BREAKS: { expanded: 840 } },
+  },
+});
+const overlay = loadTs(path.join(ROOT, "ui_template", "ui_template_overlay.ts"));
+
+function mount(late) {
+  const panel = new FakeNode("div");
+  const actions = new FakeNode("div");
+  actions.className = "ui-sidebar-actions";
+  panel.append(new FakeNode("p"));
+  if (!late) panel.append(actions);
+  const { root } = overlay.createWorkflowOverlays({
+    title: "t",
+    optionsContent: panel,
+    showProjectName: false,
+  });
+  const before = !!actions.querySelector(".ui-help-btn");
+  if (late) panel.append(actions);
+  flush();
+  const body = root.querySelector(".ui-workflow-overlay__body");
+  return {
+    before,
+    help: actions.querySelector(".ui-help-btn") ? 1 : 0,
+    split: body.classList.contains("ui-sidebar-split"),
+    scroll: !!panel.querySelector(".ui-sidebar-scroll"),
+    lastIsActions: panel.children[panel.children.length - 1] === actions,
+    watching: observers.size,
+  };
+}
+
+const early = mount(false);
+const late = mount(true);
+process.stdout.write(JSON.stringify({ early, late }));
diff --git a/resources/tester/test_359_2_help_late_actions.py b/resources/tester/test_359_2_help_late_actions.py
new file mode 100644
index 000000000..8ba004403
--- /dev/null
+++ b/resources/tester/test_359_2_help_late_actions.py
@@ -0,0 +1,41 @@
+# -*- coding: utf-8 -*-
+"""요구 359-2 · 360-2 — 좌측 패널 아래 [?] 는 액션 줄을 언제 붙여도 한 벌.
+
+① 패널 세우기 전에 붙인 줄(E05 꼴) = 바로 쪼갬 · [?]
+② 세운 뒤에 붙인 줄(E03 · E04 · E06 · E07 꼴) = 붙는 때 쪼갬 · [?] · 지켜보기 끊음
+"""
+
+import json
+import os
+import subprocess
+
+import pytest
+
+HERE = os.path.dirname(os.path.abspath(__file__))
+
+
+@pytest.fixture(scope="module")
+def results():
+    proc = subprocess.run(
+        ["node", os.path.join(HERE, "helper_359_2_late_actions.cjs")],
+        capture_output=True,
+        text=True,
+        encoding="utf-8",
+        timeout=60,
+    )
+    assert proc.returncode == 0, proc.stderr
+    return json.loads(proc.stdout)
+
+
+def test_먼저_붙인_줄은_바로_물음(results):
+    early = results["early"]
+    assert early["before"] is True
+    assert early["help"] == 1 and early["split"] and early["scroll"] and early["lastIsActions"]
+    assert early["watching"] == 0
+
+
+def test_늦게_붙인_줄도_물음_한_벌(results):
+    late = results["late"]
+    assert late["before"] is False
+    assert late["help"] == 1 and late["split"] and late["scroll"] and late["lastIsActions"]
+    assert late["watching"] == 0
diff --git a/ui_template/ui_template_overlay.ts b/ui_template/ui_template_overlay.ts
index bc3f46928..f102253af 100644
--- a/ui_template/ui_template_overlay.ts
+++ b/ui_template/ui_template_overlay.ts
@@ -201,6 +201,14 @@ function createPanel(
   if (body.childElementCount > 0) {
     body.classList.add("ui-workflow-overlay__body");
     if (isSidebar) splitSidebarActions(body);
+    // 액션 줄을 패널을 세운 뒤에 붙이는 화면(E03 · E04 · E06 · E07) — 붙는 때 쪼갬 · [?] 자리
+    if (isSidebar && !body.classList.contains("ui-sidebar-split")) {
+      const watch = new MutationObserver(() => {
+        splitSidebarActions(body);
+        if (body.classList.contains("ui-sidebar-split")) watch.disconnect();
+      });
+      watch.observe(body, { childList: true, subtree: true });
+    }
     root.append(body);
   }